YYGIFT Bluetooth Smart Bracelet IP57 Waterproof Heart Rate Monitor Pedometer Sleep Monitor Smart Fitness Tracker Wristband Watch Best for Men and Women Multi-function:Heart rate detection,Phone calls and message reminder,Display moving distance and walk steps counting and more Compatible for Android system ( Android 4.3 or above ) and IOS system ( IOS 7.0 or above ) Comfortable Wear:The device is very comfortable to wear since the band is made with TPU silicone. OLED display,with high sensitive touch screen and high-response.Support SMS,micro letter,QQ,call,vibrating alert,and directly display the contents of a short message and phone name. NOTE:Please sync the time with your phone in app, then the time will being consistent with your smart phone;Steps sometimes will have 5-10 sec delay,please wait few sec to read the date.And the bracelet is waterproof, the waterproof grade reach IP67.When use heart rate monitor, please press the heart rate button on the watch till the green light (in the back of the bracelet) turn on.